How to permanently disable WebRTC in Safari?

Hi,

I’m surprised I haven’t found any topic about this, so here’s my question: how can I permanently disable WebRTC in Safari?

As a matter of fact, I’m anxious about IP address leakage due to the implementation of WebRTC in the browser, so I’d like to inactive it forever. With Firefox, Chrome or Opera, it’s pretty straightforward. However, with Safari, it’s another story, since the “Develop—> WebRTC” menu only deactivates it for the current session.

Any idea how to disable it once and for all?

Thank you in advance for your answer!